ul.c

#include <stdio.h>

void 
helloWorld(char say[])
{
    printf("%s\n", say);
}

void 
helloworld(char say[])
{
    printf("%s%s\n", say, say);
}

int main()
{
  char someValue[] = "Hello";
  char somevalue[] = "World";
  helloWorld(someValue);/* Hello  */
  helloWorld(somevalue);/* World  */

  helloworld(someValue);/* HelloHello */
  helloworld(somevalue);/* WorldWorld */
  return 0;
}